Since 1986, Sierra Circuits has been a leading supplier of high technology, quick-turn Printed Circuit Boards. ISO-9001:2000 and MilSpec certified, Silicon Valley based company.
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About Sierra Proto Express - Contact Us

Log a Customer Service issue

Silicon Valley Office (HQ)

Sierra Proto Express
1108, West Evelyn Avenue
Sunnyvale, CA 94086
Toll free: 800-763-7503
Phone: 408-735-7137
Fax: 408-735-1408


Map/Driving Directions
Sunnyvale Office Timing:
8 AM to 5 PM Pacific Time, Mon-Fri


Customer Service for Standard, Full Service Orders
Log a customer service ticket at www.protoexpress.com/customerservice
Phone: 800-763-7503

Customer Service for No Touch Orders
Log a customer service ticket at www.protoexpress.com/customerservice
and do indicate that your issue is about No Touch.
EMAIL: (mention your order number in the subject)

Customer Service for Military Work, ITAR OR Milspec Orders
For any Military Work and Milspec Orders or Inquiries, send email to

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